$(document).ready(function() {
		var $product_main_pic = $('.product_main_pic');
		$('#pic1, #pic2, #pic3').click(function() {
			var $this = $(this);
			$product_main_pic.fadeOut(300, function() {
				$product_main_pic.attr('src', $this.attr('src'));
				$product_main_pic.fadeIn(300);
			});
		});
	});